------------[ cut here ]------------
len > ((int)(~0U >> 1))
WARNING: ./include/linux/skbuff.h:2864 at pskb_may_pull_reason include/linux/skbuff.h:2864 [inline], CPU#1: syz.2.7843/31593
WARNING: ./include/linux/skbuff.h:2864 at pskb_may_pull include/linux/skbuff.h:2882 [inline], CPU#1: syz.2.7843/31593
WARNING: ./include/linux/skbuff.h:2864 at qdisc_pkt_len_segs_init+0x4b4/0xa30 net/core/dev.c:4144, CPU#1: syz.2.7843/31593
Modules linked in:
CPU: 1 UID: 0 PID: 31593 Comm: syz.2.7843 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 06/13/2026
RIP: 0010:pskb_may_pull_reason include/linux/skbuff.h:2864 [inline]
RIP: 0010:pskb_may_pull include/linux/skbuff.h:2882 [inline]
RIP: 0010:qdisc_pkt_len_segs_init+0x4b4/0xa30 net/core/dev.c:4144
Code: 00 00 02 00 31 ff e8 bb 94 24 f8 81 e3 00 00 02 00 0f 85 fd 00 00 00 e8 6a 90 24 f8 45 89 e7 e9 2c ff ff ff e8 5d 90 24 f8 90 <0f> 0b 90 e9 ee fd ff ff 44 89 e7 89 de e8 0a 92 24 f8 41 39 dc 0f
RSP: 0018:ffffc90000a08660 EFLAGS: 00010246
RAX: ffffffff89a1e123 RBX: 0000000000000003 RCX: ffff888031439f00
RDX: 0000000000000100 RSI: 00000000fffffff6 RDI: 0000000000000000
RBP: ffff88807875f280 R08: ffffc90000a0889f R09: 0000000000000000
R10: ffffc90000a08830 R11: fffff52000141114 R12: 00000000fffffff6
R13: dffffc0000000000 R14: 1ffff1100f0ebe6b R15: ffff8880333178d8
FS:  00007f9c584936c0(0000) GS:ffff888125058000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000000f000 CR3: 000000003ad78000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 sch_handle_ingress net/core/dev.c:4485 [inline]
 __netif_receive_skb_core+0x13aa/0x30b0 net/core/dev.c:6066
 __netif_receive_skb_list_core+0x24d/0x830 net/core/dev.c:6290
 __netif_receive_skb_list net/core/dev.c:6357 [inline]
 netif_receive_skb_list_internal+0x995/0xcf0 net/core/dev.c:6448
 gro_normal_list include/net/gro.h:523 [inline]
 gro_flush_normal include/net/gro.h:531 [inline]
 napi_complete_done+0x299/0x730 net/core/dev.c:6816
 gro_cell_poll+0x5ab/0x5d0 net/core/gro_cells.c:74
 __napi_poll+0xaa/0x330 net/core/dev.c:7738
 napi_poll net/core/dev.c:7801 [inline]
 net_rx_action+0x61d/0xf50 net/core/dev.c:7958
 handle_softirqs+0x225/0x840 kernel/softirq.c:622
 do_softirq+0x76/0xd0 kernel/softirq.c:523
 </IRQ>
 <TASK>
 __local_bh_enable_ip+0xf8/0x130 kernel/softirq.c:450
 local_bh_enable include/linux/bottom_half.h:33 [inline]
 tun_rx_batched+0x616/0x790 drivers/net/tun.c:-1
 tun_get_user+0x2b44/0x4370 drivers/net/tun.c:1986
 tun_chr_write_iter+0x113/0x200 drivers/net/tun.c:2032
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x612/0xba0 fs/read_write.c:687
 ksys_write+0x150/0x270 fs/read_write.c:739
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9c5759de99
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f9c58493028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f9c57826090 RCX: 00007f9c5759de99
RDX: 000000000000fdef RSI: 0000200000000040 RDI: 000000000000000a
RBP: 00007f9c57633eaf R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9c57826128 R14: 00007f9c57826090 R15: 00007ffd49a13ec8
 </TASK>